MC68HC908GR16A Datasheet, PDF (212/270 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Timebase Module (TBM)
TBMCLKSEL
FROM CONFIG2
CGMXCLK
FROM CGM MODULE
DIVIDE BY 128
PRESCALER
÷2 ÷2 ÷2
÷2
÷2
÷2
÷2
0
TBMCLK
1
TBON
÷2 ÷2 ÷2 ÷2
÷2 ÷2
÷2 ÷2
TBMINT
TBIF
TBIE
000
R
001
010
011
100
101
110
111
Figure 17-1. Timebase Block Diagram
17.5 TBM Interrupt Rate
The interrupt rate is determined by the equation:
t_TBMRATE
=
----D-----i-v----i--d---e----r----
f_CGMXCLK
where:
f_CGMXCLK = Frequency supplied from the clock generator (CGM) module
Divider = Divider value as determined by TBR2–TBR0 settings and TBMCLKSEL, see Table 17-1
MC68HC908GR16A Data Sheet, Rev. 1.0
212
Freescale Semiconductor